import Vue from "vue";

// v-dialogDrag: 弹窗拖拽属性
// v-dialogDrag: 弹窗拖拽
Vue.directive("dialogDrag", {
  bind(el, binding, vnode, oldVnode) {
    const dialogHeaderEl = el.querySelector(".el-dialog__header");
    const dragDom = el.querySelector(".el-dialog");
    const dragBodyChild = el.querySelector(".el-dialog__body");
    dialogHeaderEl.style.cursor = "move";
    dialogHeaderEl.title = "双击可全屏";
    let suoIcon = document.createElement("i");
    suoIcon.setAttribute(
      "class",
      "el-icon-full-screen size16 pointer right-screen color-white"
    );
    dialogHeaderEl.append(suoIcon);
    //弹框可拉伸最小宽高
    let minWidth = 400;
    let minHeight = 300;
    //初始非全屏
    let isFullScreen = false;
    //当前宽高
    let nowWidth = 0;
    let nowHight = 0;
    //当前顶部高度
    let nowMarginTop = 0;
    dragDom.style.maxHeight = "90%"; //防止内容太长首次占了全屏
    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null);
    //  全屏效果
    suoIcon.onclick = e => {
      if (isFullScreen == false) {
        nowHight = dragDom.clientHeight;
        nowWidth = dragDom.clientWidth;
        nowMarginTop = dragDom.style.marginTop;
        dragDom.style.left = 0;
        dragDom.style.top = 0;
        dragDom.style.height = "100%";
        dragDom.style.width = "100%";
        dragDom.style.maxHeight = "100%";
        dragDom.style.transform = "translate(0, 0)";
        dragDom.style.marginTop = 0;
        isFullScreen = true;
        dialogHeaderEl.title = "";
        dialogHeaderEl.style.cursor = "initial";
        suoIcon.setAttribute(
          "class",
          "el-icon-copy-document size16 pointer right-screen color-white"
        );
        suoIcon.title = "点击可切换非全屏";
        // dialogHeaderEl.onmousedown = null;
      } else {
        dragDom.style.left = "50%";
        dragDom.style.top = "50%";
        dragDom.style.height = "auto";
        dragDom.style.maxHeight = "90%";
        dragDom.style.width = nowWidth + "px";
        dragDom.style.transform = "translate(-50%,-50%)";
        dragDom.style.marginTop = 0;
        dialogHeaderEl.title = "双击可全屏";
        suoIcon.title = "点击可全屏";
        isFullScreen = false;
        dialogHeaderEl.style.cursor = "move";
        suoIcon.setAttribute(
          "class",
          "el-icon-full-screen size16 pointer right-screen color-white"
        );
        // dialogHeaderEl.onmousedown = moveDown;
      }
    };
    //拉伸(右下方)效果不想要可以注释
    let resizeEl = document.createElement("div");
    dragDom.appendChild(resizeEl);
    //在弹窗右下角加上一个10-10px的控制块
    resizeEl.style.cursor = "se-resize";
    resizeEl.style.position = "absolute";
    resizeEl.style.height = "10px";
    resizeEl.style.width = "10px";
    resizeEl.style.right = "0px";
    resizeEl.style.bottom = "0px";
    resizeEl.style.zIndex = "99";
    //鼠标拉伸弹窗
    resizeEl.onmousedown = e => {
      // 记录初始x位置
      let clientX = e.clientX;
      // 鼠标按下，计算当前元素距离可视区的距离
      let disX = e.clientX - resizeEl.offsetLeft;
      let disY = e.clientY - resizeEl.offsetTop;

      document.onmousemove = function(e) {
        e.preventDefault(); // 移动时禁用默认事件

        // 通过事件委托，计算移动的距离
        let x = e.clientX - disX + (e.clientX - clientX); //这里 由于elementUI的dialog控制居中的，所以水平拉伸效果是双倍
        let y = e.clientY - disY;
        //比较是否小于最小宽高
        dragDom.style.width = x > minWidth ? `${x}px` : minWidth + "px";
        dragDom.style.height = y > minHeight ? `${y}px` : minHeight + "px";
      };
      //拉伸结束
      document.onmouseup = function(e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    };

    // 头部移动
    dialogHeaderEl.onmousedown = e => {
      if (isFullScreen) {
        return;
      }
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
      const disY = e.clientY - dialogHeaderEl.offsetTop;

      // 获取到的值带px 正则匹配替换
      let styL, styT;

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes("%")) {
        styL =
          +document.body.clientWidth * (+sty.left.replace(/\%/g, "") / 100);
        styT =
          +document.body.clientHeight * (+sty.top.replace(/\%/g, "") / 100);
      } else {
        styL = +sty.left.replace(/\px/g, "");
        styT = +sty.top.replace(/\px/g, "");
      }

      document.onmousemove = function(e) {
        // 通过事件委托，计算移动的距离
        const l = e.clientX - disX;
        const t = e.clientY - disY;
        // 移动当前元素
        dragDom.style.left = `${l + styL}px`;
        dragDom.style.top = `${t + styT}px`;

        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
      };

      document.onmouseup = function(e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    };
  }
});

// v-dialogDragWidth: 弹窗宽度拖大 拖小
Vue.directive("dialogDragWidth", {
  bind(el, binding, vnode, oldVnode) {
    const dragDom = binding.value.$el.querySelector(".el-dialog");

    el.onmousedown = e => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - el.offsetLeft;

      document.onmousemove = function(e) {
        e.preventDefault(); // 移动时禁用默认事件

        // 通过事件委托，计算移动的距离
        const l = e.clientX - disX;
        dragDom.style.width = `${l}px`;
      };

      document.onmouseup = function(e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    };
  }
});
